The effect of grain size on serrated flow of nickel

1996 ◽  
Vol 34 (3) ◽  
pp. 375-380 ◽  
Author(s):  
A Dziadon
Keyword(s):  
Grain Size ◽  
Serrated Flow

Grain size dependence of the serrated flow in a nickel based alloy

2015 ◽  
Vol 150 ◽  
pp. 108-110 ◽  
Author(s):  
Zhigang Li ◽  
Lanting Zhang ◽  
Nairong Sun ◽  
Liming Fu ◽  
Aidang Shan
Keyword(s):  
Grain Size ◽  
Size Dependence ◽  
Serrated Flow ◽  
Nickel Based Alloy

scholarly journals Depth-sensing indentation tests in studying plastic instabilities

2004 ◽  
Vol 19 (1) ◽  
pp. 31-45 ◽  
Author(s):  
N.Q. Chinh ◽  
J. Gubicza ◽  
Zs. Kovács ◽  
J. Lendvai
Keyword(s):  
Grain Size ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Solute Concentration ◽  
Metal Alloys ◽  
Depth Sensing ◽  
Serrated Flow ◽  
Indentation Tests ◽  
Grain Size And Orientation

This review surveys the phenomenon of plastic instabilities occurring in depth-sensing indentation measurements. Investigations presented focus on the characterization of Portevin–Le Châtelier type instabilities observed in different metal alloys during indentation. The effect of some important factors such as solute concentration, the formation of Guinier–Preston zones, and grain size and orientation are described and discussed. The phenomenon of plastic instabilities as serrated flow recently observed in bulk metallic glasses is also briefly reviewed.

The effect of grain size on serrated flow of nickel

1996 ◽  
Vol 34 (3) ◽  
pp. 375-380 ◽  
Author(s):  
Andrzej Dziadoń
Keyword(s):  
Grain Size ◽  
Serrated Flow

Influences of strain rate and grain size on yield and serrated flow in commercial Al-Mg alloy 5086

1999 ◽  
Vol 41 (11) ◽  
pp. 1177-1184 ◽  
Author(s):  
Matthew Wagenhofer ◽  
MarjorieAnn Erickson-Natishan ◽  
Ronald W. Armstrong ◽  
Frank J. Zerilli
Keyword(s):  
Grain Size ◽  
Strain Rate ◽  
Mg Alloy ◽  
Serrated Flow

Unusual grain-size and strain-rate effects on the serrated flow in FeMnC twin-induced plasticity steels

2012 ◽  
Vol 48 (4) ◽  
pp. 1669-1674 ◽  
Author(s):  
Lihe Qian ◽  
Pengcheng Guo ◽  
Jiangying Meng ◽  
Fucheng Zhang
Keyword(s):  
Grain Size ◽  
Strain Rate ◽  
Strain Rate Effects ◽  
Serrated Flow ◽  
Rate Effects

Effect of Shock Loading on the Microstructure of Uniloy 326

1974 ◽  
Vol 32 ◽  
pp. 504-505
Author(s):  
K. P. Staudhammer ◽  
L. E. Murr
Keyword(s):  
Grain Size ◽  
Shock Loading ◽  
Current Investigation ◽  
Two Phase ◽  
05 C ◽  
Shock Deformation ◽  
Heat Treated

The effect of shock loading on a variety of steels has been reviewed recently by Leslie. It is generally observed that significant changes in microstructure and microhardness are produced by explosive shock deformation. While the effect of shock loading on austenitic, ferritic, martensitic, and pearlitic structures has been investigated, there have been no systematic studies of the shock-loading of microduplex structures.In the current investigation, the shock-loading response of millrolled and heat-treated Uniloy 326 (thickness 60 mil) having a residual grain size of 1 to 2μ before shock loading was studied. Uniloy 326 is a two phase (microduplex) alloy consisting of 30% austenite (γ) in a ferrite (α) matrix; with the composition.3% Ti, 1% Mn, .6% Si,.05% C, 6% Ni, 26% Cr, balance Fe.

Aspects of microanalysis in a transmission electron microscope

1978 ◽  
Vol 36 (1) ◽  
pp. 510-511
Author(s):  
R. Sinclair ◽  
B.E. Jacobson
Keyword(s):  
Grain Size ◽  
Electron Beam ◽  
Electron Microscope ◽  
Chemical Analysis ◽  
Transmission Electron Microscope ◽  
Vapor Deposition ◽  
Critical Currents ◽  
X Ray ◽  
Fine Grain ◽  
Transmission Electron

INTRODUCTIONThe prospect of performing chemical analysis of thin specimens at any desired level of resolution is particularly appealing to the materials scientist. Commercial TEM-based systems are now available which virtually provide this capability. The purpose of this contribution is to illustrate its application to problems which would have been intractable until recently, pointing out some current limitations.X-RAY ANALYSISIn an attempt to fabricate superconducting materials with high critical currents and temperature, thin Nb3Sn films have been prepared by electron beam vapor deposition [1]. Fine-grain size material is desirable which may be achieved by codeposition with small amounts of Al2O3 . Figure 1 shows the STEM microstructure, with large (∽ 200 Å dia) voids present at the grain boundaries. Higher quality TEM micrographs (e.g. fig. 2) reveal the presence of small voids within the grains which are absent in pure Nb3Sn prepared under identical conditions. The X-ray spectrum from large (∽ lμ dia) or small (∽100 Ǻ dia) areas within the grains indicates only small amounts of A1 (fig.3).

Novel magneto-optical recording materials: Bi-substituted garnet films

1991 ◽  
Vol 49 ◽  
pp. 776-777
Author(s):  
Takao Suzuki ◽  
Hossein Nuri
Keyword(s):  
Grain Size ◽  
Amorphous Film ◽  
Nitrogen Atmosphere ◽  
Optical Recording ◽  
Garnet Film ◽  
Media Noise ◽  
Garnet Films ◽  
Order Of Magnitude ◽  
A New Technique ◽  
A Current

For future high density magneto-optical recording materials, a Bi-substituted garnet film ((BiDy)3(FeGa)5O12) is an attractive candidate since it has strong magneto-optic effect at short wavelengths less than 600 nm. The signal in read back performance at 500 nm using a garnet film can be an order of magnitude higher than a current rare earth-transition metal amorphous film. However, the granularity and surface roughness of such crystalline garnet films are the key to control for minimizing media noise.We have demonstrated a new technique to fabricate a garnet film which has much smaller grain size and smoother surfaces than those annealed in a conventional oven. This method employs a high ramp-up rate annealing (Γ = 50 ~ 100 C/s) in nitrogen atmosphere. Fig.1 shows a typical microstruture of a Bi-susbtituted garnet film deposited by r.f. sputtering and then subsequently crystallized by a rapid thermal annealing technique at Γ = 50 C/s at 650 °C for 2 min. The structure is a single phase of garnet, and a grain size is about 300A.

Structure of second phases in TiAl alloys containing Cr and B

1991 ◽  
Vol 49 ◽  
pp. 576-577
Author(s):  
Ernest L. Hall ◽  
Shyh-Chin Huang
Keyword(s):  
Grain Size ◽  
Second Phase ◽  
Structure And Properties ◽  
Tial Alloys ◽  
Second Phases ◽  
Interstitial Elements

Addition of interstitial elements to γ-TiAl alloys is currently being explored as a method for improving the properties of these alloys. Previous work in which a number of interstitial elements were studied showed that boron was particularly effective in refining the grain size in castings, and led to enhanced strength while maintaining reasonable ductility. Other investigators have shown that B in γ-TiAl alloys tends to promote the formation of TiB2 as a second phase. In this study, the microstructure of Bcontaining TiAl alloys was examined in detail in order to describe the mechanism by which B alters the structure and properties of these alloys.

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